http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56606
Bug #: 56606
Summary: GCC refuses to emit long calls for operator new/delete
on PowerPC
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: g...@mrozekma.com
-mlongcall seems to have no effect on operator new and operator delete. For
example, given the code:
> extern void foo();
> void bar() {
> foo();
> new char;
> }
A normal run of GCC on PowerPC will generate the (abridged) assembly:
> bl _Z3foov
> bl _Znwj
Running GCC with the -mlongcall option generates:
> lis r9, _Z3foov@ha
> addi r9, r9, _Z3foov@l
> mtctr r9
> bctrl
> bl _Znwj
The branch to foo() was expanded as expected, but the branch to operator new is
still short. Calls to random libc and libstdc++ functions are all converted; so
far operator new and operator delete are the only ones I've seen that don't
work. This seems similar to bug 12769, but that was for generated functions
---
GCC build info:
> Target: ppc-redhat-linux
> Configured with: ./configure --prefix=/opt/gcc-4.7.2-ppc
> --mandir=/opt/gcc-4.7.2-ppc/share/man --enable-shared --enable-threads=posix
> --with-system-zlib --enable-languages=c,c++ --build=ppc-redhat-linux
> --host=ppc-redhat-linux --target=ppc-redhat-linux
> gcc version 4.7.2 (GCC)
Test compiled with:
> g++ -mlongcall -c -o test.o test.cpp
